Potential conflict between 2 arriving B727's as the lower one makes a wrong direction turn. Non adherence to ATC clearance instruction.

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Attributes
ACN	353578
Time
Date	199611
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dca
State Reference	DC
Altitude	msl bound lower : 2200 msl bound upper : 2200
Environment
Flight Conditions	Marginal
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : dca
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent other
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Aircraft 2
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp pilot : instrument
Experience	flight time last 90 days : 240 flight time total : 12000 flight time type : 7000
ASRS Report	353578
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other other spatial deviation
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 4000 vertical : 150
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Dca was using mt vernon approach to runway 36. Approach control (119.85) instructed us to turn to a heading of 020 degrees and expedite our descent to 1500 ft (we were at 3000 ft MSL). We observed, on TCASII, an aircraft at 2 O'clock and 2000 ft MSL. As we descended through 2200 ft we received a TCASII RA to climb, which we did. I had instructed the first officer to look for the conflicting aircraft. When we got the climb RA, he saw a B727 in our immediate vicinity. I never made visual contact with the aircraft. Approach control was advised of our altitude deviation. Dca approach control replied, 'I know.' as we cleared the other aircraft, approach control cleared us for a visual to runway 36. According to information provided by dca approach control, the other aircraft had made a wrong turn. Even so, we were never informed about conflicting traffic. If it hadn't been for TCASII, I probably would be a statistic rather than filing this report.

Original NASA ASRS Text

Title: POTENTIAL CONFLICT BTWN 2 ARRIVING B727'S AS THE LOWER ONE MAKES A WRONG DIRECTION TURN. NON ADHERENCE TO ATC CLRNC INSTRUCTION.

Narrative: DCA WAS USING MT VERNON APCH TO RWY 36. APCH CTL (119.85) INSTRUCTED US TO TURN TO A HDG OF 020 DEGS AND EXPEDITE OUR DSCNT TO 1500 FT (WE WERE AT 3000 FT MSL). WE OBSERVED, ON TCASII, AN ACFT AT 2 O'CLOCK AND 2000 FT MSL. AS WE DSNDED THROUGH 2200 FT WE RECEIVED A TCASII RA TO CLB, WHICH WE DID. I HAD INSTRUCTED THE FO TO LOOK FOR THE CONFLICTING ACFT. WHEN WE GOT THE CLB RA, HE SAW A B727 IN OUR IMMEDIATE VICINITY. I NEVER MADE VISUAL CONTACT WITH THE ACFT. APCH CTL WAS ADVISED OF OUR ALTDEV. DCA APCH CTL REPLIED, 'I KNOW.' AS WE CLRED THE OTHER ACFT, APCH CTL CLRED US FOR A VISUAL TO RWY 36. ACCORDING TO INFO PROVIDED BY DCA APCH CTL, THE OTHER ACFT HAD MADE A WRONG TURN. EVEN SO, WE WERE NEVER INFORMED ABOUT CONFLICTING TFC. IF IT HADN'T BEEN FOR TCASII, I PROBABLY WOULD BE A STATISTIC RATHER THAN FILING THIS RPT.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.